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Lab 05 e-m IVC 2009 - Measurement of Charge to Mass Ratio...

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Measurement of Charge to Mass Ratio Experiment Equipment: 1) Apparatus for e/m 2) Power supply 3) Flashlight 4) Two multimeter DMM 5) Leads 6) Compass if available Laboratory Objectives 1) Observe the deflection of an electron beam in a magnetic field. 2) Determine the electron charge to mass ratio e/m. e/m laboratory pg 1
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Theory of charge to mass Experiment If a charge q moves with a velocity v in a magnetic field B that is at a right angle to the direction of motion, it will experience the magnetic part of the Lorentz force : F B = qvB We will use this fact to determine e / m of the electron by measuring the radius of that circle. To this end we must: · produce a narrow beam of electrons of known energy , · produce a uniform magnetic field, · find a way to measure the radius r of the circular orbit of the electrons in that magnetic field , and · find the relation between that radius and the ratio e / m . e/m laboratory pg 2
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The Ealing apparatus consists of a special tube in which a beam of electrons is emitted from a heated filament (cathode) and attracted toward an anode at electric potential V . e/m laboratory pg 3 A small amount of mercury vapor present in the evacuated tube becomes ionized upon collision with the electrons.
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